Using nmap library in Python program

Question

I have a simple Python program which uses nmap library to do port scanning.

from optparse import OptionParser
import nmap  
from threading import * 

screenLock=Semaphore(value=1)

def nmapScan(thost,tport):
    x=nmap.PortScanner()
    x.scan(thost,tport)
    state=x[thost]['tcp'][int(tport)]['state']
    print "[*]" + thost + "tcp/"+tport+" "+state


def main():
    parser=OptionParser('usage %prog -H <target host> -p <target port>')
    parser.add_option('-H',dest='thost',type='string',help='specify target host')
    parser.add_option('-p',dest='tports',type='string',help='specify target port[s] seperated by comma')
    (options,args)=parser.parse_args()
    thost=options.thost
    tports=options.tports
    tports=tports.split(',')
    if (thost==None)|(tports==None):
        print parser.usage
        exit(0)
    for i in tports:
        nmapScan(thost,i)

main()

When i run the program, i get the following error.

akshayrajmacbookpro$ python nmapScanner.py -H 192.168.1.60 -p 80,443
Traceback (most recent call last):
  File "nmapScanner.py", line 28, in <module>
main()
File "nmapScanner.py", line 26, in main
nmapScan(thost,i)
File "nmapScanner.py", line 10, in nmapScan
state=x[thost]['tcp'][int(tport)]['state']
File "build/bdist.macosx-10.11-intel/egg/nmap/nmap.py", line 555, in __getitem__
KeyError: '192.168.1.60'

I tried using url instead of ip in the command line. But I get the same error. Being new to Python, I am not able to understand and resolve this.

What do you expect state to have?

fips
– fips

2016-05-20 12:24:54 +00:00
Commented May 20, 2016 at 12:24 — fips
– fips, Commented May 20, 2016 at 12:24

fips · Accepted Answer · 2016-05-20 12:40:37Z

2

x (instance of nmap.PortScanner) does not contain those keys. To be able to iterate the scan results you can do this:

for host, result in x._scan_result['scan'].items():
    print "[*]" + thost + "tcp/" + tport + " " + result['status']['state']

It's best if you looked at the docs or source code of python-nmap to see what other useful info is available e.g. Service name and version that is listening on that port.

More info here: https://bitbucket.org/xael/python-nmap/src/f368486a2cf12ce2bf3d5978614586e89c49c417/nmap/nmap.py?at=default&fileviewer=file-view-default#nmap.py-381

answered May 20, 2016 at 12:40

fips

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2 Comments

Akshay Over a year ago

But according to the documentation at pypi.python.org/pypi/python-nmap, my syntax is correct @fips

fips Over a year ago

You are right, it seems both options should work. Actually when you do x[host] it accesses _scan_result['scan'] internally which is essentially the same thing. So you were getting a key error because that host did not exist in the result. Here is the line that attempts to get the specified host results: bitbucket.org/xael/python-nmap/src/… Maybe you can check before accessing it using if host in x.all_hosts().

Mustafa · Accepted Answer · 2016-11-21 18:22:57Z

0

The host does not exist in the result of the scan as a "Key" for the Dictionary that forms a part of the data thrown up by scan data. That is probably, in my opinion, the reason for the error. Thanks

answered Nov 21, 2016 at 18:22

Mustafa

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